<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="dist/vue.js"></script>
</head>
<body>
    {{ msg }}
    <div id="app">
        {{msg}}
        <input v-model="msg" />
    </div>
</body>
<script>
    var vm = new Vue({
        el: '#app',
        data: {
            msg: 'hello Vue'
        }
    });

    console.log(vm);
    console.log(vm.$el===document.getElementById('app'));
    console.log(vm.$data);
</script>
</html>